Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It only says 'Set' implying mutation, but fails to mention necessary conditions (e.g., armature must be in edit mode), side effects (e.g., dependency graph update), error cases (e.g., bone not found), or return value. This is insufficient for an AI agent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.